Avionics Cross Word Puzzle

1. Indication of aircraft speed.
4. An art of flying without moving.
7. Part of Instrument Landing System that signals crew members of distance to runway, consisting of three markers(inner, middle, and outer).
8. Upward angle of the airplane`s wings with respect to the horizontal.
11. A small addition to the tips of a wing to control air movement.
12. An alternative navigational system.
13. An Austrian physicist after whom a dimensionless quantity representing the ratio of flow speed relative to a boundary and the local speed of sound is named.
15. Abbreviation of a display unit which indicate the lateral map with navigation information.
18. In flight, akin to the automobile steering.
19. A device used to trim down lift in an aircraft.
20. Moveable surfaces on the leading edge of the wing.

2. Contour of earth.
3. Manufacturer of Attitude Indicator.
5. Measurable distance between the leading and trailing edges of a wing form.
6. An optical sensor to read out the engine RPM.
9. A simple concept to help prevent runway incursions.
10. Method of using fixed visual reference on the ground or sea by means of sight or radar, sometimes with the help of a map (or) nautical chart.
14. An area used for the landing and takeoff of helicopters.
16. Nose of an aircraft is pitched up to minimize the touchdown rate of speed.
17. Kitchen of an aircraft where all service items are stowed.
20. An acronym seen in reference to the operating hours, or time remaining, on an aircraft engine .